A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IX. The most overdense region atz∼ 5 inhabited by a massive radio galaxy
Hisakazu Uchiyama; Takuji Yamashita; Tohru Nagao; Yoshiaki Ono; Jun Toshikawa; Kohei Ichikawa; Nozomu Kawakatu; Masaru Kajisawa; Yoshiki Toba; Yoshiki Matsuoka; Mariko Kubo; Masatoshi Imanishi; Kei Ito; Toshihiro Kawaguchi; Chien-Hsiu Lee; Tomoki Saito
Publications of the Astronomical Society of Japan, 22 Sep. 2022

Quasar Negative Feedback to Surrounding Galaxies Probed with Ly$α$ Emitters and Continuum-Selected Galaxies
Yuta Suzuki; Yoshiki Matsuoka; Satoshi Kikuta; Hisakazu Uchiyama; Haruka Kusakabe; Masatoshi Imanishi
23 May 2025

Environment of SDSS quasars at $z=0.4$$-$$1.0$ explored by Subaru HSC
Kohei Shibata; Tohru Nagao; Hisakazu Uchiyama; Mariko Kubo; Yoshiki Toba; Kiyoaki Christopher Omori; Toshihiro Kawaguchi; Yuta Suzuki
07 May 2025

UNIONS: The Ultraviolet Near-Infrared Optical Northern Survey
Stephen Gwyn; Alan W. McConnachie; Jean-Charles Cuillandre; Ken C. Chambers; Eugene A. Magnier; Michael J. Hudson; Masamune Oguri; Hisanori Furusawa; Hendrik Hildebrandt; Raymond Carlberg; Sara L. Ellison; Junko Furusawa; Raphaël Gavazzi; Rodrigo Ibata; Yannick Mellier; Ken Osato; H. Aussel; Lucie Baumont; Manuel Bayer; Olivier Boulade; Patrick Côté; David Chemaly; Cail Daley; Pierre-Alain Duc; A. Ellien; Sébastien Fabbro; Leonardo Ferreira; Itsna K. Fitriana; Emeric Le Floc'h; Hammer; Francois; Yoshinobu Fudamoto; Hua Gao; L. W. K. Goh; Tomotsugu Goto; Sacha Guerrini; Axel Guinot; Vincent Hénault-Brunet; Yuichi Harikane; Kohei Hayashi; Nick Heesters; Kohei Ichikawa; Martin Kilbinger; P. B. Kuzma; Qinxun Li; Tobías I. Liaudat; Chien-Cheng Lin; Oliver Müller; Nicolas F. Martin; Yoshiki Matsuoka; Gustavo E. Medina; Hironao Miyatake; Satoshi Miyazaki; Charlie T. Mpetha; Tohru Nagao; Julio F. Navarro; Masafumi Niwano; Itsuki Ogami; Nobuhiro Okabe; Masafusa Onoue; Gregory S. H. Paek; Laura C. Parker; David R. Patton; Fabian Hervas Peters; Simon Prunet; Rubén Sánchez-Janssen; M. Schultheis; Federico Sestito; Simon E. T. Smith; J. -L. Starck; Else Starkenburg; Connor Stone; Christopher Storfer; Yoshihisa Suzuki; Erben; T.; Salvatore Taibi; G. F. Thomas; Zhang TianFang; Yoshiki Toba; Hisakazu Uchiyama; David Valls-Gabaud; Kim A. Venn; Ludovic Van Waerbeke; Richard J. Wainscoat; Scott Wilkinson; Anna Wittje; Taketo Yoshida; Yuxing Zhong
18 Mar. 2025

Mining for Protoclusters at $z\sim4$ from Photometric Datasets with Deep Learning
Yoshihiro Takeda; Nobunari Kashikawa; Kei Ito; Jun Toshikawa; Rieko Momose; Kent Fujiwara; Yongming Liang; Rikako Ishimoto; Takehiro Yoshioka; Junya Arita; Mariko Kubo; Hisakazu Uchiyama
18 Nov. 2024

Environments around quasars at $z\sim$3 revealed by wide-field imaging with Subaru HSC and CFHT
Yuta Suzuki; Hisakazu Uchiyama; Yoshiki Matsuoka; Jun Toshikawa; Stephen Gwyn; Masatoshi Imanishi; Chengze Liu; Akatoki Noboriguchi; Marcin Sawicki; Yoshiki Toba
29 Jul. 2024

Cosmic Himalayas: The Highest Quasar Density Peak Identified in a 10,000 deg$^2$ Sky with Spatial Discrepancies between Galaxies, Quasars, and IGM HI
Yongming Liang; Masami Ouchi; Dongsheng Sun; Nobunari Kashikawa; Zheng Cai; Sebastiano Cantalupo; Kentaro Nagamine; Hidenobu Yajima; Takanobu Kirihara; Haibin Zhang; Mingyu Li; Rhythm Shimakawa; Xiaohui Fan; Kei Ito; Masayuki Tanaka; Yuichi Harikane; J. Xavier Prochaska; Andrea Travascio; Weichen Wang; Martin Elvis; Giuseppina Fabbiano; Junya Arita; Masafusa Onoue; John D. Silverman; Dong Dong Shi; Fangxia An; Takuma Izumi; Kazuhiro Shimasaku; Hisakazu Uchiyama; Chenghao Zhu
24 Apr. 2024

Galaxy properties from the outskirts to the core of a protocluster at z=3.699
Jun Toshikawa; Stijn Wuyts; Nobunari Kashikawa; Hisakazu Uchiyama; Malcolm Bremer; Marcin Sawicki; Yoshiaki Ono; Mariko Kubo; Kei Ito
24 Apr. 2024

New technique to select recent fast-quenching galaxies at $z\sim2$ using the optical colors
Mariko Kubo; Tohru Nagao; Hisakazu Uchiyama; Takuji Yamashita; Yoshiki Toba; Masaru Kajisawa; Yuta Yamamoto
15 Oct. 2023

An enhanced abundance of bright galaxies in protocluster candidates at z~3-5
Jun Toshikawa; Stijn Wuyts; Nobunari Kashikawa; Chengze Liu; Marcin Sawicki; Roderik Overzier; Mariko Kubo; Hisakazu Uchiyama; Kei Ito; Malcolm Bremer; Yoshiaki Ono; Tadayuki Kodama; Yen-Ting Lin; Tomoki Saito
12 Oct. 2023

The physical origin for spatially large scatter of IGM opacity at the end of reionization: the IGM Ly$α$ opacity-galaxy density relation
Rikako Ishimoto; Nobunari Kashikawa; Daichi Kashino; Kei Ito; Yongming Liang; Zheng Cai; Takehiro Yoshioka; Katsuya Okoshi; Toru Misawa; Masafusa Onoue; Yoshihiro Takeda; Hisakazu Uchiyama
11 Jul. 2022

A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VII. Redshift Evolution of Radio Galaxy Environments at z=0.3-1.4
Hisakazu Uchiyama; Takuji Yamashita; Tohru Nagao; Kohei Ichikawa; Yoshiki Toba; Shogo Ishikawa; Mariko Kubo; Masaru Kajisawa; Toshihiro Kawaguchi; Nozomu Kawakatu; Chien-Hsiu Lee; Akatoki Noboriguchi
14 Jun. 2022

A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed by High-z Radio Galaxies at z~4
Hisakazu Uchiyama; Takuji Yamashita; Jun Toshikawa; Nobunari Kashikawa; Kohei Ichikawa; Mariko Kubo; Kei Ito; Nozomu Kawakatu; Tohru Nagao; Yoshiki Toba; Yoshiaki Ono; Yuichi Harikane; Masatoshi Imanishi; Masaru Kajisawa; Chien-Hsiu Lee; Yongming Liang
03 Dec. 2021

Third Data Release of the Hyper Suprime-Cam Subaru Strategic Program
Hiroaki Aihara; Yusra AlSayyad; Makoto Ando; Robert Armstrong; James Bosch; Eiichi Egami; Hisanori Furusawa; Junko Furusawa; Sumiko Harasawa; Yuichi Harikane; Bau-Ching Hsieh; Hiroyuki Ikeda; Kei Ito; Ikuru Iwata; Tadayuki Kodama; Michitaro Koike; Mitsuru Kokubo; Yutaka Komiyama; Xiangchong Li; Yongming Liang; Yen-Ting Lin; Robert H. Lupton; Nate B Lust; Lauren A. MacArthur; Ken Mawatari; Sogo Mineo; Hironao Miyatake; Satoshi Miyazaki; Surhud More; Takahiro Morishima; Hitoshi Murayama; Kimihiko Nakajima; Fumiaki Nakata; Atsushi J. Nishizawa; Masamune Oguri; Nobuhiro Okabe; Yuki Okura; Yoshiaki Ono; Ken Osato; Masami Ouchi; Yen-Chen Pan; Andrés A. Plazas Malagón; Paul A. Price; Sophie L Reed; Eli S. Rykoff; Takatoshi Shibuya; Mirko Simunovic; Michael A. Strauss; Kanako Sugimori; Yasushi Suto; Nao Suzuki; Masahiro Takada; Yuhei Takagi; Tadafumi Takata; Satoshi Takita; Masayuki Tanaka; Shenli Tang; Dan S. Taranu; Tsuyoshi Terai; Yoshiki Toba; Edwin L. Turner; Hisakazu Uchiyama; Bovornpratch Vijarnwannaluk; Christopher Z Waters; Yoshihiko Yamada; Naoaki Yamamoto; Takuji Yamashita
30 Aug. 2021

A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IV. Rapidly Growing (Super-)Massive Black Holes in Extremely Radio-Loud Galaxies
Kohei Ichikawa; Takuji Yamashita; Yoshiki Toba; Tohru Nagao; Kohei Inayoshi; Maria Charisi; Wanqiu He; Alexander Y. Wagner; Masayuki Akiyama; Bovornpratch Vijarnwannaluk; Xaioyang Chen; Masaru Kajisawa; Taiki Kawamuro; Chien-Hsiu Lee; Yoshiki Matsuoka; Malte Schramm; Hyewon Suh; Masayuki Tanaka; Hisakazu Uchiyama; Yoshihiro Ueda; Janek Pflugradt; Hikaru Fukuchi
05 Aug. 2021

Interrelation of the environment of Ly$α$ emitters and massive galaxies at $2
Kei Ito; Nobunari Kashikawa; Masayuki Tanaka; Mariko Kubo; Yongming Liang; Jun Toshikawa; Hisakazu Uchiyama; Rikako Ishimoto; Takehiro Yoshioka; Yoshihiro Takeda
04 May 2021

Faint Quasars Live in the Same Number Density Environments as Lyman Break Galaxies at z ~ 4
Hisakazu Uchiyama; Masayuki Akiyama; Jun Toshikawa; Nobunari Kashikawa; Roderik Overzier; Tohru Nagao; Kohei Ichikawa; Murilo Marinello; Masatoshi Imanishi; Masayuki Tanaka; Yoshiki Matsuoka; Yutaka Komiyama; Shogo Ishikawa; Masafusa Onoue; Mariko Kubo; Yuichi Harikane; Kei Ito; Shigeru Namiki; Yongming Liang
20 Nov. 2020

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XI. Proximity Zone Analysis for Faint Quasar Spectra at z~6
Rikako Ishimoto; Nobunari Kashikawa; Masafusa Onoue; Yoshiki Matsuoka; Takuma Izumi; Michael A. Strauss; Seiji Fujimoto; Masatoshi Imanishi; Kei Ito; Kazushi Iwasawa; Toshihiro Kawaguchi; Chien-Hsiu Lee; Yongming Liang; Ting-Yi Lu; Rieko Momose; Yoshiki Toba; Hisakazu Uchiyama
14 Sep. 2020

Statistical correlation between the distribution of Ly$α$ emitters and IGM HI at $z\sim2.2$ mapped by Subaru/Hyper Suprime-Cam
Yongming Liang; Nobunari Kashikawa; Zheng Cai; Xiaohui Fan; J. Xavier Prochaska; Kazuhiro Shimasaku; Masayuki Tanaka; Hisakazu Uchiyama; Kei Ito; Rhythm Shimakawa; Kentaro Nagamine; Ikkoh Shimizu; Masafusa Onoue; Jun Toshikawa
04 Aug. 2020

The UV Luminosity Function of Protocluster Galaxies at $z\sim4$: the Bright-end Excess and the Enhanced Star Formation Rate Density
Kei Ito; Nobunari Kashikawa; Jun Toshikawa; Roderik Overzier; Mariko Kubo; Hisakazu Uchiyama; Yongming Liang; Masafusa Onoue; Masayuki Tanaka; Yutaka Komiyama; Chien-Hsiu Lee; Yen-Ting Lin; Murilo Marinello; Crystal L. Martin; Takatoshi Shibuya
06 Jul. 2020

Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). III. Discovery of a z = 4.72 Radio Galaxy with Lyman Break Technique
Takuji Yamashita; Tohru Nagao; Hiroyuki Ikeda; Yoshiki Toba; Masaru Kajisawa; Yoshiaki Ono; Masayuki Tanaka; Masayuki Akiyama; Yuichi Harikane; Kohei Ichikawa; Toshihiro Kawaguchi; Taiki Kawamuro; Kotaro Kohno; Chien-Hsiu Lee; Kianhong Lee; Yoshiki Matsuoka; Mana Niida; Kazuyuki Ogura; Masafusa Onoue; Hisakazu Uchiyama
08 Jun. 2020

Discovery of Protoclusters at z~3.7 & 4.9: Embedded in Primordial Superclusters
Jun Toshikawa; Matthew A. Malkan; Nobunari Kashikawa; Roderik Overzier; Hisakazu Uchiyama; Kazuaki Ota; Shogo Ishikawa; Kei Ito
03 Dec. 2019

Planck far-infrared detection of Hyper Suprime-Cam protoclusters at $\bf z\sim4$: hidden AGN and star formation activity
Mariko Kubo; Jun Toshikawa; Nobunari Kashikawa; Yi-Kuan Chiang; Roderik Overzier; Hisakazu Uchiyama; David L. Clements; David M. Alexander; Yuichi Matsuda; Tadayuki Kodama; Yoshiaki Ono; Tomotsugu Goto; Tai-An Cheng; Kei Ito
21 Nov. 2019

Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program
Hiroaki Aihara; Yusra AlSayyad; Makoto Ando; Robert Armstrong; James Bosch; Eiichi Egami; Hisanori Furusawa; Junko Furusawa; Andy Goulding; Yuichi Harikane; Chiaki Hikage; Paul T. P. Ho; Bau-Ching Hsieh; Song Huang; Hiroyuki Ikeda; Masatoshi Imanishi; Kei Ito; Ikuru Iwata; Anton T. Jaelani; Ryota Kakuma; Kojiro Kawana; Satoshi Kikuta; Umi Kobayashi; Michitaro Koike; Yutaka Komiyama; Xiangchong Li; Yongming Liang; Yen-Ting Lin; Wentao Luo; Robert Lupton; Nate B. Lust; Lauren A. MacArthur; Yoshiki Matsuoka; Sogo Mineo; Hironao Miyatake; Satoshi Miyazaki; Surhud More; Ryoma Murata; Shigeru V. Namiki; Atsushi J. Nishizawa; Masamune Oguri; Nobuhiro Okabe; Sakurako Okamoto; Yuki Okura; Yoshiaki Ono; Masato Onodera; Masafusa Onoue; Ken Osato; Masami Ouchi; Takatoshi Shibuya; Michael A. Strauss; Naoshi Sugiyama; Yasushi Suto; Masahiro Takada; Yuhei Takagi; Tadafumi Takata; Satoshi Takita; Masayuki Tanaka; Tsuyoshi Terai; Yoshiki Toba; Hisakazu Uchiyama; Yousuke Utsumi; Shiang-Yu Wang; Wenting Wang; Yoshihiko Yamada
29 May 2019

The brightest UV-selected galaxies in protoclusters at $z\sim4$: Ancestors of Brightest Cluster Galaxies?
Kei Ito; Nobunari Kashikawa; Jun Toshikawa; Roderik Overzier; Masayuki Tanaka; Mariko Kubo; Takatoshi Shibuya; Shogo Ishikawa; Masafusa Onoue; Hisakazu Uchiyama; Yongming Liang; Ryo Higuchi; Crystal Martin; Chien-Hsiu Lee; Yutaka Komiyama; Song Huang
02 Apr. 2019

Minor Contribution of Quasars to Ionizing Photon Budget at z~6: Update on Quasar Luminosity Function at the Faint-end with Subaru/Suprime-Cam
Masafusa Onoue; Nobunari Kashikawa; Chris J. Willott; Pascale Hibon; Myungshin Im; Hisanori Furusawa; Yuichi Harikane; Masatoshi Imanishi; Shogo Ishikawa; Satoshi Kikuta; Yoshiki Matsuoka; Tohru Nagao; Yuu Niino; Yoshiaki Ono; Masami Ouchi; Masayuki Tanaka; Ji-Jia Tang; Jun Toshikawa; Hisakazu Uchiyama
13 Sep. 2017

GOLDRUSH. III. A Systematic Search of Protoclusters at $z\sim4$ Based on the $>100\,\mathrm{deg^2}$ Area
Jun Toshikawa; Hisakazu Uchiyama; Nobunari Kashikawa; Masami Ouchi; Roderik Overzier; Yoshiaki Ono; Yuichi Harikane; Shogo Ishikawa; Tadayuki Kodama; Yuichi Matsuda; Yen-Ting Lin; Masafusa Onoue; Masayuk Tanaka; Tohru Nagao; Masayuki Akiyama; Yutaka Komiyama; Tomotsugu Goto; Chien-Hsiu Lee
30 Aug. 2017

Clustering of quasars in a wide luminosity range at redshift 4 with Subaru Hyper Suprime-Cam wide field imaging
Wanqiu He; Masayuki Akiyama; James Bosch; Motohiro Enoki; Yuichi Harikane; Hiroyuki Ikeda; Nobunari Kashikawa; Toshihiro Kawaguchi; Yutaka Komiyama; Chien-Hsiu Lee; Yoshiki Matsuoka; Satoshi Miyazaki; Tohru Nagao; Masahiro Nagashima; Mana Niida; Atsushi J Nishizawa; Masamune Oguri; Masafusa Onoue; Taira Oogi; Masami Ouchi; Andreas Schulze; Yuji Shirasaki; John D. Silverman; Manobu M. Tanaka; Masayuki Tanaka; Yoshiki Toba; Hisakazu Uchiyama; Takuji Yamashita
27 Apr. 2017

Luminous Quasars Do Not Live in the Most Overdense Regions of Galaxies at z~4
Hisakazu Uchiyama; Jun Toshikawa; Nobunari Kashikawa; Roderik Overzier; Yi-Kuan Chiang; Murilo Marinello; Masayuki Tanaka; Yuu Niino; Shogo Ishikawa; Masafusa Onoue; Kohei Ichikawa; Masayuki Akiyama; Jean Coupon; Yuichi Harikane; Masatoshi Imanishi; Tadayuki Kodama; Yutaka Komiyama; Chien-Hsiu Lee; Yen-Ting Lin; Satoshi Miyazaki; Tohru Nagao; Atushi J. Nishizawa; Yoshiaki Ono; Masami Ouchi; Shiang-Yu Wang
20 Apr. 2017

Enhancement of Galaxy Overdensity around Quasar Pairs at z<3.6 based on the Hyper Suprime-Cam Subaru Strategic Program Survey
Masafusa Onoue; Nobunari Kashikawa; Hisakazu Uchiyama; Masayuki Akiyama; Yuichi Harikane; Masatoshi Imanishi; Yutaka Komiyama; Yoshiki Matsuoka; Tohru Nagao; Atsushi J. Nishizawa; Masamune Oguri; Masami Ouchi; Masayuki Tanaka; Yoshiki Toba; Jun Toshikawa
20 Apr. 2017

First Data Release of the Hyper Suprime-Cam Subaru Strategic Program
Hiroaki Aihara; Robert Armstrong; Steven Bickerton; James Bosch; Jean Coupon; Hisanori Furusawa; Yusuke Hayashi; Hiroyuki Ikeda; Yukiko Kamata; Hiroshi Karoji; Satoshi Kawanomoto; Michitaro Koike; Yutaka Komiyama; Robert H. Lupton; Sogo Mineo; Hironao Miyatake; Satoshi Miyazaki; Tomoki Morokuma; Yoshiyuki Obuchi; Yukie Oishi; Yuki Okura; Paul A. Price; Tadafumi Takata; Manobu M. Tanaka; Masayuki Tanaka; Yoko Tanaka; Tomohisa Uchida; Fumihiro Uraguchi; Yousuke Utsumi; Shiang-Yu Wang; Yoshihiko Yamada; Hitomi Yamanoi; Naoki Yasuda; Nobuo Arimoto; Masashi Chiba; Francois Finet; Hiroki Fujimori; Seiji Fujimoto; Junko Furusawa; Tomotsugu Goto; Andy Goulding; James E. Gunn; Yuichi Harikane; Takashi Hattori; Masao Hayashi; Krzysztof G. Helminiak; Ryo Higuchi; Chiaki Hikage; Paul T. P. Ho; Bau-Ching Hsieh; Kuiyun Huang; Song Huang; Masatoshi Imanishi; Ikuru Iwata; Anton T. Jaelani; Hung-Yu Jian; Nobunari Kashikawa; Nobuhiko Katayama; Takashi Kojima; Akira Konno; Shintaro Koshida; Haruka Kusakabe; Alexie Leauthaud; C. -H. Lee; Lihwai Lin; Yen-Ting Lin; Rachel Mandelbaum; Yoshiki Matsuoka; Elinor Medezinski; Shoken Miyama; Rieko Momose; Anupreeta More; Surhud More; Shiro Mukae; Ryoma Murata; Hitoshi Murayama; Tohru Nagao; Fumiaki Nakata; Hiroko Niikura; Atsushi J. Nishizawa; Masamune Oguri; Nobuhiro Okabe; Yoshiaki Ono; Masato Onodera; Masafusa Onoue; Masami Ouchi; Tae-Soo Pyo; Takatoshi Shibuya; Kazuhiro Shimasaku; Melanie Simet; Joshua Speagle; David N. Spergel; Michael A. Strauss; Yuma Sugahara; Naoshi Sugiyama; Yasushi Suto; Nao Suzuki; Philip J. Tait; Masahiro Takada; Tsuyoshi Terai; Yoshiki Toba; Edwin L. Turner; Hisakazu Uchiyama; Keiichi Umetsu; Yuji Urata; Tomonori Usuda; Sherry Yeh; Suraphong Yuma
27 Feb. 2017

The Galaxy--Halo Connection in High-Redshift Universe: Details and Evolution of Stellar-to-Halo Mass Ratios of Lyman Break Galaxies on CFHTLS Deep Fields
Shogo Ishikawa; Nobunari Kashikawa; Jun Toshikawa; Masayuki Tanaka; Takashi Hamana; Yuu Niino; Kohei Ichikawa; Hisakazu Uchiyama
20 Dec. 2016

Multi-Sightline Observation of Narrow Absorption Lines in Lensed Quasar SDSS J1029+2623
Toru Misawa; Cristian Saez; Jane C. Charlton; Michael Eracleous; George Chartas; Franz E. Bauer; Naohisa Inada; Hisakazu Uchiyama
04 May 2016

A Systematic Survey of Protoclusters at $z\sim3\mathrm{-}6$ in the CFHTLS Deep Fields
Jun Toshikawa; Nobunari Kashikawa; Roderik Overzier; Matthew A. Malkan; Hisanori Furusawa; Shogo Ishikawa; Masafusa Onoue; Kazuaki Ota; Masayuki Tanaka; Yuu Niino; Hisakazu Uchiyama
04 May 2016

Galaxy Overdense Regions in the Distant Universe Revealed by Wide-Area Sky Survey and TAO
Grant-in-Aid for Scientific Research (A)
The University of Tokyo
01 Apr. 2025 - 31 Mar. 2030

大規模多波長データで解明する、クェーサーとその周辺銀河との共進化
若手研究
01 Apr. 2022 - 31 Mar. 2025